Change these tests to actually trigger the execCommand from the iframe context.

chrome/browser/extensions/extension_dom_clipboard_apitest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/test/browser_test_utils.h"
 #include "net/dns/mock_host_resolver.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 #include "url/gurl.h"
 
 namespace {
 
 class ClipboardApiTest : public ExtensionApiTest {
  public:
   bool LoadHostedApp(const std::string& app_name,
                      const std::string& launch_page);
   bool ExecuteCopyInSelectedTab();
   bool ExecutePasteInSelectedTab();
-  bool ExecuteCopyInIframeInSelectedTab();
-  bool ExecutePasteInIframeInSelectedTab();
+  bool ExecuteCommandInIframeInSelectedTab(const char* command);
 
  private:
   bool ExecuteScriptInSelectedTab(const std::string& script);
 };
 
 bool ClipboardApiTest::LoadHostedApp(const std::string& app_name,
                                      const std::string& launch_page) {
   host_resolver()->AddRule("*", "127.0.0.1");
 
   if (!StartEmbeddedTestServer()) {
@@ skipping 26 matching lines @@
       "window.domAutomationController.send(document.execCommand('copy'))";
   return ExecuteScriptInSelectedTab(kScript);
 }
 
 bool ClipboardApiTest::ExecutePasteInSelectedTab() {
   const char kScript[] =
       "window.domAutomationController.send(document.execCommand('paste'))";
   return ExecuteScriptInSelectedTab(kScript);
 }
 
-bool ClipboardApiTest::ExecuteCopyInIframeInSelectedTab() {
+bool ClipboardApiTest::ExecuteCommandInIframeInSelectedTab(
+    const char* command) {
   const char kScript[] =
       "var ifr = document.createElement('iframe');\n"
       "document.body.appendChild(ifr);\n"
-      "window.domAutomationController.send("
-          "ifr.contentDocument.execCommand('copy'));";
-  return ExecuteScriptInSelectedTab(kScript);
-}
-
-bool ClipboardApiTest::ExecutePasteInIframeInSelectedTab() {
-  const char kScript[] =
-      "var ifr = document.createElement('iframe');\n"
-      "document.body.appendChild(ifr);\n"
-      "window.domAutomationController.send("
-          "ifr.contentDocument.execCommand('paste'));";
-  return ExecuteScriptInSelectedTab(kScript);
+      "ifr.contentDocument.write('<script>parent.domAutomationController.send("
+          "document.execCommand(\"%s\"))</script>');";
+  return ExecuteScriptInSelectedTab(base::StringPrintf(kScript, command));
 }
 
 bool ClipboardApiTest::ExecuteScriptInSelectedTab(const std::string& script) {
   bool result;
   CHECK(content::ExecuteScriptAndExtractBool(
         browser()->tab_strip_model()->GetActiveWebContents(),
         script,
         &result));
   return result;
 }
 
 }  // namespace
 
 IN_PROC_BROWSER_TEST_F(ClipboardApiTest, Extension) {
   ASSERT_TRUE(StartEmbeddedTestServer());
   ASSERT_TRUE(RunExtensionTest("clipboard/extension")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(ClipboardApiTest, ExtensionNoPermission) {
   ASSERT_TRUE(StartEmbeddedTestServer());
   ASSERT_TRUE(RunExtensionTest("clipboard/extension_no_permission"))
       << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(ClipboardApiTest, HostedApp) {
   ASSERT_TRUE(LoadHostedApp("hosted_app", "main.html")) << message_;
 
   EXPECT_TRUE(ExecuteCopyInSelectedTab()) << message_;
   EXPECT_TRUE(ExecutePasteInSelectedTab()) << message_;
-  EXPECT_TRUE(ExecuteCopyInIframeInSelectedTab()) << message_;
-  EXPECT_TRUE(ExecutePasteInIframeInSelectedTab()) << message_;
+  EXPECT_TRUE(ExecuteCommandInIframeInSelectedTab("copy")) << message_;
+  EXPECT_TRUE(ExecuteCommandInIframeInSelectedTab("paste")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(ClipboardApiTest, HostedAppNoPermission) {
   ASSERT_TRUE(LoadHostedApp("hosted_app_no_permission", "main.html"))
       << message_;
 
   EXPECT_FALSE(ExecuteCopyInSelectedTab()) << message_;
   EXPECT_FALSE(ExecutePasteInSelectedTab()) << message_;
-  EXPECT_FALSE(ExecuteCopyInIframeInSelectedTab()) << message_;
-  EXPECT_FALSE(ExecutePasteInIframeInSelectedTab()) << message_;
+  EXPECT_FALSE(ExecuteCommandInIframeInSelectedTab("copy")) << message_;
+  EXPECT_FALSE(ExecuteCommandInIframeInSelectedTab("paste")) << message_;
 }